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Note Derivative instruments and hedging activities (Derivative instruments and hedging activities- Additional Information) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instrument Detail [Abstract] |  |  |
Fair Value Hedges At Fair Value Net | $ 0 | $ 0 |
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net | 1,273 | (923) | $ (124)
Derivative Liabilities Credit Risk Gain Losses | $ (600) | 200 | (900)
Derivative Assets Credit Risk Gain Losses |  | $ (100) | $ 400

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- Definition This item represents the estimated gains or losses included in earnings attributable to the impact of changes in credit risk on derivative assets. + References No definition available. + Details
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- Definition This item represents the estimated gains or losses included in earnings attributable to the impact of changes in credit risk on derivative liabilities. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Net fair value of all derivative instruments designated as fair value hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4F -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624186-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41322-113958 + Details
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